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The paper is concerned with small devices designed for the monitoring of the electromagnetic space. The presented device determines the angle of arrival AOA and the frequency of the received microwave signal. It covers the angular segment of the space, and works within the frequency band of 500 MHz width. It contains three element antenna array, direction finding DF channel and instantaneous frequency measurement IFM channel. Such a structure performs the so called single-pulse phase method of direction of signal arrival estimation. The experimental version of the device worked in conjunction with the personal computer. This set has been successfully used for recognition of signals emitted by a remote electromagnetic sources working within the L band. The device's architecture and results of experiments are presented.